研究了固溶、时效对挤压添加钙的三种AM50镁合金组织和力学性能的影响.结果表明:合金挤压后,随着固溶时间的增加,Mg17Al12相以弥散状溶解在基体镁中,而Al2Ca相相当稳定,部分变细,逐步断开并出现球化现象;随着时效时间的增加,Mg17Al12相以粒状从基体中析出,而Al2Ca相在时效过程中变化极小.固溶后,挤压合金的硬度和抗拉强度下降.时效后,挤压添加1%Ca的合金抗拉强度略有升高,未加和加入2%Ca的抗拉强度略有下降,三种合金的硬度增加到峰值后逐步下降.未加和加入2%Ca的合金固溶后塑性显著增加,时效后塑性略有下降;而加入1%Ca的合金固溶后塑性略有下降,时效后塑性显著提高.

Effects of solution and aging treatment on microstructure and mechanical properties of extruded AM50+xCa alloys(x=0,1,2 wt%) were studied.With solution time increasing,the secondary phase Mg17Al12 was solid solutioned dispersedly into the Mg matrix while Al2Ca was rather stable,partly became thinner ,then gradually broken and spheroidized.With aging time increasing,Mg17Al12 was precipitated from the Mg matrix as the form of particles and Al2Ca changed a little.After solution treatment,the hardness and tensile properties of extruded AM50+xCa alloys decreased.After aging treatment,the alloy hardness increased to its peak fast then decreased,tensile properties of AM50 and AM50+2%Ca decreased a little while tensile properties of AM50+1%Ca increased a little.The ductility of extruded AM50 and AM50+2%Ca increased remarkably after solution treatment and decreased a little after aging treatment,while ductility of extruded AM50+1%Ca decreased a little after solution treatment and increased remarkably after aging treatment.